/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.wangbl.zxing;

import java.util.Collection;
import java.util.HashSet;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;

import com.google.zxing.ResultPoint;
import com.wangbl.infomanager.R;
import com.wangbl.infomanager.utils.Logger;

/**
 * This view is overlaid on top of the camera preview. It adds the viewfinder
 * rectangle and partial transparency outside it, as well as the laser scanner
 * animation and result points. �Զ����View������ʱ�м���ʾ��
 */
public final class ViewfinderView extends View {

	private static final int[] SCANNER_ALPHA = { 0, 64, 128, 192, 255, 192,
			128, 64 };
	private static final long ANIMATION_DELAY = 10L;
	private static final int OPAQUE = 0xFF;
	private static final String TAG = "ViewfinderView";

	private final Paint paint;
	private Bitmap resultBitmap;
	private final int maskColor;
	private final int resultColor;
	private final int frameColor;
	private final int laserColor;
	private final int resultPointColor;
	private int scannerAlpha;
	private Collection<ResultPoint> possibleResultPoints;
	private Collection<ResultPoint> lastPossibleResultPoints;

	// This constructor is used when the class is built from an XML resource.
	public ViewfinderView(Context context, AttributeSet attrs) {
		super(context, attrs);

		// Initialize these once for performance rather than calling them every
		// time in onDraw().
		paint = new Paint();
		Resources resources = getResources();
		maskColor = resources.getColor(R.color.viewfinder_mask);
		resultColor = resources.getColor(R.color.result_view);
		frameColor = resources.getColor(R.color.viewfinder_frame);
		laserColor = resources.getColor(R.color.viewfinder_laser);
		resultPointColor = resources.getColor(R.color.possible_result_points);
		scannerAlpha = 0;
		possibleResultPoints = new HashSet<ResultPoint>(5);
	}
	int offset = 0;//130
	int move = 0;
	
	final int WIDTH = 220;
	final int HEIGHT = 200;
	
	public int dp2px(float dpValue) {
		float v = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
				dpValue, getContext().getResources().getDisplayMetrics());
		return (int) (v + 0.5f);
  }

	@Override
	public void onDraw(Canvas canvas) {
		Rect frame = CameraManager.get().getFramingRect();
		Logger.i(TAG, "frame:"+frame);
		if (frame == null) {
			return;
		}
		int width = canvas.getWidth();
		int height = canvas.getHeight();
		
		// Draw the exterior (i.e. outside the framing rect) darkened
		paint.setColor(resultBitmap != null ? resultColor : maskColor);
		
		canvas.drawRect(0, 0, width, frame.top-offset, paint);
		canvas.drawRect(0, frame.top-offset, frame.left, frame.bottom + 1-offset, paint);
		canvas.drawRect(frame.right + 1, frame.top-offset, width, frame.bottom + 1-offset,
				paint);
		canvas.drawRect(0, frame.bottom + 1-offset, width, height, paint);

		if (resultBitmap != null) {
			// Draw the opaque result bitmap over the scanning rectangle
			paint.setAlpha(OPAQUE);
			canvas.drawBitmap(resultBitmap, frame.left, frame.top, paint);
		} else {

			// Draw a two pixel solid black border inside the framing rect
			paint.setColor(frameColor);
			canvas.drawRect(frame.left, frame.top-offset, frame.right + 1,
					frame.top + 2-offset, paint);
			canvas.drawRect(frame.left, frame.top + 2-offset, frame.left + 2,
					frame.bottom - 1-offset, paint);
			canvas.drawRect(frame.right - 1, frame.top-offset, frame.right + 1,
					frame.bottom - 1-offset, paint);
			canvas.drawRect(frame.left, frame.bottom - 1-offset, frame.right + 1,
					frame.bottom + 1-offset, paint);

			// Draw a red "laser scanner" line through the middle to show
			// decoding is active
			paint.setColor(laserColor);
		//	paint.setAlpha(SCANNER_ALPHA[scannerAlpha]);
			scannerAlpha = (scannerAlpha + 1) % SCANNER_ALPHA.length;
//			int middle = frame.height() / 2 + frame.top;
//			canvas.drawRect(frame.left + 2, middle - 1-offset, frame.right - 1,
//					middle + 2-offset, paint);
			if(move + frame.top > frame.bottom){
				move = 0;
			} else {
				move += 5;
			}
			canvas.drawRect(frame.left + 2, frame.top - 1-offset+move, frame.right - 1,
					frame.top-offset+10+move, paint);


			Collection<ResultPoint> currentPossible = possibleResultPoints;
			Collection<ResultPoint> currentLast = lastPossibleResultPoints;
			if (currentPossible.isEmpty()) {
				lastPossibleResultPoints = null;
			} else {
				possibleResultPoints = new HashSet<ResultPoint>(5);
				lastPossibleResultPoints = currentPossible;
				paint.setAlpha(OPAQUE);
				paint.setColor(resultPointColor);
				for (ResultPoint point : currentPossible) {
					canvas.drawCircle(frame.left + point.getX(), frame.top
							+ point.getY(), 6.0f, paint);
				}
			}
			if (currentLast != null) {
				paint.setAlpha(OPAQUE / 2);
				paint.setColor(resultPointColor);
				for (ResultPoint point : currentLast) {
					canvas.drawCircle(frame.left + point.getX(), frame.top
							+ point.getY(), 3.0f, paint);
				}
			}
			// Request another update at the animation interval, but only
			// repaint the laser line,
			// not the entire viewfinder mask.
			postInvalidateDelayed(ANIMATION_DELAY, frame.left, frame.top-offset,
					frame.right, frame.bottom-offset);
		}
	}

	public void drawViewfinder() {
		resultBitmap = null;
		invalidate();
	}

	/**
	 * Draw a bitmap with the result points highlighted instead of the live
	 * scanning display.
	 *
	 * @param barcode
	 *            An image of the decoded barcode.
	 */
	public void drawResultBitmap(Bitmap barcode) {
		resultBitmap = barcode;
		invalidate();
	}

	public void addPossibleResultPoint(ResultPoint point) {
		possibleResultPoints.add(point);
	}

}
